Managing Superdome Complexes: A Guide for HP-UX System Administrators

Planning Superdome Configurations
Rules and Guidelines for Configuring a Complex
Appendix A328
Where To Add Cells
• If the cells in a given partition will not fill all four of the slots
in a given crossbar, plug the cells into alternate slots.
Explanation: Pairs of slots (0 and 1, 2 and 3, etc.) share ports on the
crossbar controller (XBC). To even out traffic, a partition that uses
only two slots in a crossbar should use slots that don’t share ports,
such as 0 and 2, or 1 and 3. For example, configure two two-cell
partitions in a single cabinet by assigning slots 0 and 2 to the first
partition and slots 1 and 3 to the second.
Rule of thumb: When starting to add cells to a crossbar that has no
occupied slots, fill the even slots first, then the odd slots.